We cannot know eternal law until we evolve to Godhood, but we can know natural law. The task of moral law is to find actions that promote the essence of any entity, thus we look for actions that lead evolution to Godhood, which is the essence or goal of evolution. Of the two main faculties mentioned by Aquinas, intellect (intuition) and reason (senses-empirical), which we have applied in discerning the end goal of evolution--the intuitive intellect seems to lead, with reason following close behind.
Until knowledge of evolution, and then the end goal of evolution, was made known, the main direction of traditional religion was toward the inward, involutionary way to know God Within or the Father Within. In the Twofold Path we do affirm the Inward Path to see God through the Traditional Church, and we affirm the Outward Path of evolution to attain Godhood in the Evolutionary Christian Church.